This has been posted deep in another thread but I wanted to make it easy to find.
Coolant circulating pump for the M25 engine (which is a D850 Kubota block):
Universal part #300203
Retail price $385.30
Kubota part #15534-73030
Retail price $108.00
Gasket Kubota #15676-73430
Hope this helps someone!
*Former* Website Administrator, C36/375IA
*Former* owner, C36 tr/fk #255, Santa Barbara, CA